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As mentioned earlier, forms authentication gives you control over the interface that users use to log into your web application. Along with its benefits, this approach also creates extra work, because you have to build the login page. Other forms of authentication supply some prebuilt portions. For instance, if you re using Windows authentication, the browser provides a standard dialog box. In Passport authentication, the user interface of the Passport site is always used for logging in. Creating the login page for forms authentication doesn t require a lot of work, though. It s just worth noting that forms authentication is merely a framework for building an authentication system, rather than an all-in-one system that s complete and ready to use. The new Membership API, on the other hand, includes a prebuilt login control that can be used either on a separate login page or within any page of your application that provides a prebuilt login user interface. This user interface is customizable and communicates with the Membership API to log the user in automatically. The control does most of the work of creating custom login pages. In most cases, creating a custom login page requires nothing more than adding an .aspx page to your solution with a login control on it. You don t need to catch any events or write any code if you are fine with the default behavior of the control (which will usually be the case). You will learn more details about this control in 21.

However, none of them is reflected in the form data that s posted back That means this information will be lost after every postback Traditionally, statelessness has been overcome with the use of simple cookies, session-based cookies, and various other workarounds All of these mechanisms require homemade (and sometimes painstaking) measures To deal with this limitation, ASPNET has devised its own integrated state serialization mechanism Essentially, once your page code has finished running (and just before the final HTML is rendered and sent to the client), ASPNET examines all the properties of all the controls on your page If any of these properties has been changed from its initial state, ASPNET makes a note of this information in a name/value collection Finally, ASPNET takes all the information it has amassed and then serializes it as a Base64 string.

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We prefer having publicly available resources in a separate folder and restricting access to any other location of the web application, or the other way round. You will learn more about authorization and the configuration steps for it in 23.

When you use forms authentication, you are responsible for maintaining the details of the users who access your system. The most important details are the credentials that the user needs in order to log into the system. Not only do you need to devise a way to store them, but you also need to ensure that they are stored securely. Also, you need to provide some sort of administration tools for managing the users stored in your custom store. The Membership API framework ships with a prebuilt schema for storing credentials in a SQL Server database. So, you can save lots of time using this existing schema; furthermore, the schema is extensible. Still, you are responsible for backing up the credentials store securely so that you can restore it in case of a system failure. All these considerations don t apply to most other types of authentication. In Windows authentication, user credentials are stored by the underlying operating system. Windows uses a variety of techniques to keep them secure automatically so that you don t need to perform any work of your own. In Passport authentication, the credentials are stored securely on Passport servers.

(A Base64 string ensures that there aren t any special characters that wouldn t be valid HTML) The final string is inserted in the <form> section of the page as a new hidden field When the page is posted back, ASPNET follows these steps: 1 ASPNET re-creates the page and control objects based on its defaults Thus, the page has the same state that it had when it was first requested 2 Next, ASPNET deserializes the view state information and updates all the controls This returns the page to the state it was in before it was sent to the client the last time 3 Finally, ASPNET adjusts the page according to the posted back form data.

Table 21-6 lists the styles supported by the Login control. Every style works in the same way. You can set color and font properties directly, or you use the CssClass property for assigning a CSS class. Table 21-6. The Styles Supported by the Login Control

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